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The mother of rap star Kanye West has died at the age of 58 after cosmetic surgery developed complications.Dr Donda West, who managed the star's businesses and educational foundation and was the subject of his song Hey Mama, died in Los Angeles on Saturday.

Her publicist Patricia Green said she passed away "as the result of complications from a cosmetic surgical procedure", but gave no more details.

West's spokesman said the family "asks for privacy during this time of grief".

The 30-year-old often spoke publicly of his close relationship with his mother. She raised him alone after her husband left when West was three.

'Inspirational'

In Hey Mama, on West's 2005 album Late Registration, he sang: "Hey Mama, I wanna scream so loud for you, cuz I'm so proud of you. I appreciate what you allowed for me, I just want you to be proud of me."

In May, she published the book Raising Kanye: Life Lessons from the Mother of a Hip-Hop Star, in which she paid homage to her famous son.

She was chairwoman of the Kanye West Foundation, a non-profit organisation that aims to improve literacy and stop people dropping out of school.

Ms Green said: "May Donda's work and deeds be an inspiration to each of us, may we start each day knowing that support of family and community are central to purpose."